JPH0823648A - Rotating electric machine - Google Patents

Abstract

PURPOSE:To provide a rotating machine which has such a frame supporting structure that the noise level of external frame plates ran be lowered and stator windings can be more efficiently cooled, and then, the framework of the structure can be worked in a short time. CONSTITUTION:A rotating electric machine has a frame supporting structure which supports a stator 12 with outer frame plates 7 through a framework 15 and inner frame plates 6 and recessed sections 15a are formed on the internal side face of the framework 15 so that the framework 15 can only come into contact with a stator core 2 on both sides of the recessed sections 15a and support the stator 12 and, at the same time, the discharge port of a ventilation duct 3 in the core 2 can be positioned to the space section 16 between the recessed sections 15a and the outer peripheral surface of the core 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary electric machine, and is particularly useful when applied to a frame support structure for supporting a stator core.

[0002]

2. Description of the Related Art FIG. 2A is a longitudinal sectional view of an essential part of a frame supporting structure of a rotary electric machine according to the prior art, and FIG. 2B is a transverse sectional view of an essential part of the frame supporting structure supported by (a). is there.
In both figures, 1 is a stator winding, 2 is a stator core, 3 is a ventilation duct, 4 is a clamp, 5 is a frame bone, 6 is a frame middle plate, 7 is a frame outer plate, 8 is a stator plate, Reference numeral 9 is a stator key, 10 is a wedge, 11 is a slot, and 12 is a stator.

Of these, the stator 12 is the stator core 2c.
And a stator winding 1. The stator core 2 is formed by stacking silicon steel plates 2a punched in a fixed shape with a plurality of ventilation ducts 3 arranged at regular intervals in the left-right direction in the drawing (direction of a rotation axis not shown), and has the left and right ends in the drawing respectively. It is integrally formed by the clamp 4 provided and a stator plate 8 provided on the outer peripheral surface, and a plurality of stator windings 1 are housed in the slots 11 of the stator core 2 and fixed by the wedge 10. ing.

The stator 12 is supported by the frame outer plate 7 via the frame bone 5 and the frame middle plate 8.
That is, the stator 12 is disposed inside the plurality of frame bones 5 with its position fixed by the stator key 9, and the outer peripheral surface of the stator core 2 is supported by contacting the entire inner surface of the frame bones 5. There is.

[0005]

By the way, in the rotary electric machine having the frame supporting structure as described above, the electromagnetic vibration generated in the stator 12 is transmitted to the frame outer plate 7 through the frame bone 5 and the frame middle plate 6. . This frame outer plate 7
The vibration transmitted to is easily changed to noise because the area of the frame outer plate 7 is wider than other vibrating portions and the shape thereof is flat. Therefore, in order to reduce the noise level, it is necessary to reduce the vibration of the frame outer plate 7, but since the outer peripheral surface of the stator core 2 is in close contact with the entire inner surface of the frame bone 5 as described above, The vibrations are easily transmitted to the frame outer plate 7, so that the vibration of the frame outer plate 7 is increased and a large noise is generated.

The stator core 2 is provided with the ventilation duct 3 as described above in order to effectively cool the stator winding 1, but the ventilation duct 3 occupies the outer peripheral surface of the stator core 2.
Since the inner side surface of the frame bone 5 partially closes the discharge port, the inner side surface impedes the discharge of the cooling air and reduces the cooling performance.

Further, since the outer peripheral surface of the stator core 2 is in contact with the inner side surface of the frame bone 5 over the entire length in the rotation axis direction, the accuracy of the inner side surface is at least over the entire length in the rotation axis direction. Machining is required to obtain Therefore, processing time is required, and the manufacturing cost is increased accordingly.

Therefore, in view of the above-mentioned prior art, the present invention is capable of lowering the noise level of the frame outer plate and enhancing the cooling performance of the fixed winding, and further, having a frame support structure having a short frame bone machining time. The purpose is to provide an electric machine.

[0009]

According to a first aspect of the present invention which achieves the above object, a stator is constituted by a frame outer plate via a frame bone provided along an outer peripheral surface of a stator core of the stator. A rotary electric machine having a frame supporting structure for supporting, wherein a concave portion along the rotation axis direction is formed on the inner side surface of the frame bone, and the inner side surface of the frame bone is formed only on both sides in the rotation axis direction of the concave portion. The stator core may be in contact with the outer peripheral surface of the stator core to support the stator.

A second structure of the present invention that achieves the above object is the same as the first structure, in which the stator core is provided with a ventilation duct along its radial direction, and the exhaust port of this ventilation duct is provided. Occupy a space between the concave portion of the frame bone and the outer peripheral surface of the stator core.

[0011]

According to the first aspect of the present invention, the frame bone and the stator core are in contact with each other only on both sides of the recess provided in the frame bone, and the stator is connected through the short contact section. The electromagnetic vibrations that occur in the frame are transmitted to the frame outer plate. Therefore, the electromagnetic vibration is difficult to be transmitted to the frame outer plate. Moreover, the section that requires machining on the inner surface of the frame bone is short.

Further, according to the present invention having the second structure, in addition to the operation of the first structure, the inner surface of the frame bone does not block the outlet of the ventilation duct.

[0013]

Embodiments of the present invention will now be described in detail with reference to the drawings. The same parts as those of the conventional art are designated by the same reference numerals, and the overlapping detailed description will be omitted.

FIG. 1A is a longitudinal sectional view of an essential part showing a frame supporting structure of a rotary electric machine according to an embodiment of the present invention, and FIG. 1B is a transverse sectional view of an essential part of the frame supporting structure shown in FIG. 1A. is there.
In both figures, 15 is a frame bone, 15a is a recess, 16
Is a space, and the others are the same as those in FIG.

That is, the frame supporting structure for a rotary electric machine according to this embodiment includes a frame bone 15 in place of the frame bone 5 in the frame supporting structure for a rotary electric machine shown in FIG.

The frame bone 15 has a recess 15 on its inner surface.
a is formed. The recess 15a is shorter than the entire length of the stator core 2 in the left-right direction in the drawing (direction of the rotation axis (not shown)), and when the stator 12 is inserted inside the frame bone 15 and its position is fixed by the stator key 9. The recess 15a is provided at a position where the inner side surface of the frame bone 15 and the outer peripheral surface of the stator core 2 are in contact with each other in the left and right direction in the figure. That is, the frame bone 15 and the stator core 2 are in contact with each other only at both ends of the stator core 2 in the left-right direction in the drawing to support the stator 12.

The outlet of the ventilation duct 3 is occupied in the space 16 between the recess 15a of the frame bone 15 and the outer peripheral surface of the stator core 2.

Therefore, according to the above embodiment, the stator core 2
The frame bone 15 and the frame bone 15 are in contact with each other only at the left and right ends of the stator core 2 in FIG. 1, and the electromagnetic vibration generated in the stator 12 is transmitted to the frame outer plate 7 through this short contact section. Therefore, the electromagnetic vibration is difficult to be transmitted to the frame outer plate 7, and the vibration of the frame outer plate is small. Therefore, the level of noise generated in the frame outer plate 7 becomes lower than in the conventional case.

Further, the frame bone 15 is machined by the recess 1
It is sufficient to omit 5a and perform only on the inner side surface in the short contact section described above. Therefore, the processing time can be greatly reduced as compared with the conventional method, and the manufacturing cost can be reduced accordingly.

Further, the inner surface of the frame bone 15 does not obstruct the discharge port of the ventilation duct 3 to prevent the discharge of the cooling air, and the cooling air can be efficiently discharged, so that the cooling performance is improved.

[0021]

According to the present invention as specifically described above with reference to the embodiments, since the contact area between the stator core and the frame bone is short, electromagnetic vibration is less likely to be transmitted to the frame outer plate, compared to the conventional case. The noise level is lowered, and the machining time of the frame bone is shortened, so that the manufacturing cost can be reduced accordingly. Further, since the inner side surface of the frame bone does not block the discharge port of the ventilation duct to prevent the discharge of the cooling air, the cooling performance is improved.

[Brief description of drawings]

FIG. 1A is a longitudinal sectional view of an essential part of a frame supporting structure of a rotating electric machine according to an embodiment of the present invention, and FIG. 1B is a transverse sectional view of an essential part of the frame supporting structure shown in FIG.

2A is a longitudinal sectional view of a main part of a frame supporting structure of a rotary electric machine according to a conventional technique, and FIG. 2B is a transverse sectional view of a main part of the frame supporting structure shown in FIG.

[Explanation of symbols]

 1 Stator Winding 2 Stator Iron Core 3 Ventilation Duct 6 Frame Middle Plate 7 Frame Outer Plate 12 Stator 15 Frame Bone 15a Recess 16 Space

Claims (2)

[Claims] 1. A rotary electric machine having a frame support structure for supporting a stator by a frame outer plate via a frame bone provided along an outer peripheral surface of a stator core of the stator, wherein A recess is formed on the side surface along the rotation axis direction, and the inner side surface of the frame bone and the stator core outer peripheral surface are in contact with each other only on both sides of the recess in the rotation axis direction to support the stator. A rotating electric machine characterized by. 2. The rotating electric machine according to claim 1, wherein the stator core is provided with a ventilation duct along a radial direction thereof, and the exhaust port of the ventilation duct has a recess of the frame bone and an outer periphery of the stator core. A rotating electric machine characterized by being occupied in a space between the surface and the surface.